openntp not really a good choice as ntp server imho. Not good way to monitor what its doing with ntpq or ntpdc, etc. like you can with the full ntp client. Its ok for keep some boxes time somewhat correct.

If you want to join the pool, just run full ntp on your pfsense box. Simple enough to do. This is what I did before I moved to virtual, now I use ntp on the actual host hardware as the ntp server vs the pfsense box.

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You are port forwarding incoming ntp traffic to the pfSense LAN interface but you are running ntpd on WAN and not LAN.Either enable ntpd on LAN as well (hold ctrl to select more interfaces) or remove the port forward and just set the firewall rule to the WAN interface.

Similarly there is no need to port forward to the LAN interface for webGUI access. Just open a firewall hole to WAN.